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In this paper we present results from several implementations of silicon cochleae whose dynamics are governed by the Hopf equation. These silicon cochleae exhibit the majority of active, nonlinear characteristics of the biological cochlea such as large-signal compression, two-tone suppression, the creation of distortion products and so forth. Here we explore the coupling between resonant sections...
This paper presents results from integrated circuit (IC) implementations of the active, nonlinear, two dimensional (2D) silicon cochlea. It begins by developing an active, 2D cochlea model which is based on the idea that the cochlear amplifier (CA) has dynamics governed by the Hopf equation. The realisation of the active 2D model leads to several hardware implementations that are based on two slightly...
Recent work in cochlear amplifier modeling has focused on systems which show the dynamics of a Hopf bifurcation. We show that these systems are examples of a generic amplifier topology, the self-tuned regenerative amplifier (STRA). The STRA is a feedback-stabilized regenerative amplifier that can be operated in a region of supercritical stability. The signatures of Hopf amplification, such as a cubic...
In this paper we present a 2-D silicon cochlea which includes an automatic quality factor control (AQC) loop. This control-loop is an improved version of that presented in [1] where the control-loop imposes both a ceiling and a threshold level on the output amplitude of the basilar membrane (BM) resonators. In this improved version we include only a single set-point in our control-loop. This allows...
In this paper we present the circuits for a 2-D silicon cochlea whose basilar membrane resonant elements are constructed using oscillators whose dynamic behaviour is governed by the Hopf differential equation. By using Hopf oscillators we are able to model some of the behaviour of the outer hair cells (OHCs) whose action is responsible for the cochlea's nonlinear behaviour.
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